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>>I just noticed that the bridge devices and ovs devices are no longer
>>removed after instance deletion.
>>So using brctl show and ovs-vsctl show the devices are still there.

>The tool exists already as it is called: neutron-ovs-cleanup
> You will have the same issues with name spaces but we also have a tool for
>that: neutron-netns-cleanup

Not exactly, I do not want to touch the interfaces that are in use.
As far as I know this tool will simple remove everything, also properly configured interfaces.

Cheers,
Robert